Cephalosporin derivatives

Abstract

The present invention relates to novel cephalosporin derivatives, processes for preparing thereof, compositions for preventing and/or treating infectious diseases which comprise the novel cephalosporin derivatives as active components, and the intermediate compounds in the synthesis of cephalosporin derivatives and processes for producing thereof. The present invention is based on the selection of groups containing a condensed heterocyclic ring, particularly a triazolopyrimidine ring or a thiadiazolopyrimidine ring, as substituents at the 3-position of the cephem skeleton, and of groups containing a catechol moiety, particularly a catechol carboxymethyloxyimino moiety or a catechol carboxyimino moiety, as substituents at the 7-position of the cephem skeleton. The compounds of the present invention containing the aforementioned substituents have a strong antibacterial activity against Gram-negative bacteria and also against Gram-positive bacteria including methicillin-resistant Staphylococcus aureus. These compounds are extremely useful for the treatment of infectious diseases.

What is claimed is: 
     
       1. A cephalosporin derivative represented by the formula (XIV): ##STR48## or pharmacuetically or veterinarily acceptable non-toxic salts or solvates or non-toxic salts of solvates thereof: wherein R 1  represents a hydrogen atom or an amino-protecting group, no represents a hydrogen atom, a methyl group, a carboxyl group, or protected carboxyl group, R 3  represents a hydrogen atom or a ethyl group, R 6  represents a hydrogen atom or a carboxy protecting group, X represents a group: ##STR49## wherein R 8  and R 9  are the same or different and represent hydroxy groups or acetoxy groups, and Y represents a group: ##STR50## wherein R 13  represents a methyl group and R 14  represents a carboxyl group or a protected carboxyl group. 
     
     
       2. A cephalosporin derivative as claimed in claim 1, wherein R 1  and R 6  each represent a hydrogen atom. 
     
     
       3. A cephalosporin derivative as claimed in claim 2, wherein R 2  represents a carboxyl group or a protected carboxyl group. 
     
     
       4. A cephalosporin derivative as claimed in claim 2, wherein R 2  represents a carboxyl group, R 3  represents a hydrogen atom, R 8  and R 9  represent hydroxy groups, R 13  represents a methyl group, and R 14  represents a carboxyl group. 
     
     
       5. A cephalosporin derivative as claimed in claim 3, wherein the absolute configuration of the carbon atom to which R 2  and R 3  are connected is (S)-configuration. 
     
     
       6. A cephalosporin derivative as claimed in claim 4, wherein the absolute configuration of the carbon atom to which R 2  and R 3  are connected is (S)-configuration. 
     
     
       7. An antibiotic pharmaceutical or antibiotic veterinary composition which comprises a pharmacuetically or veterinarily acceptable carrier and a pharmaceutically or veterinarily effective amount of at east one member selected from group consisting of cephalosporin derivatives represented by the formula (XIV): ##STR51## non-toxic salts, solvates and non-toxic salts of solvates thereof; wherein R 1  represents a hydrogen atom or an amino-protecting group, R 2  represents a hydrogen atom, a methyl group, a carboxyl group, or a protected carboxyl group, R 3  represents a hydrogen atom or a methyl group, R 6  represents a hydrogen atom or a carboxy protecting group, X represents a group: ##STR52## wherein R 8  and R 9  are the same or different and represent hydroxy groups or acetoxy groups, and Y represents a group: ##STR53## wherein R 12  represents a methyl group and R 14  represents a carboxyl group or a protected carboxyl group. 
     
     
       8. A composition as claimed in claim 7, wherein R 1  and R 6  each represent a hydrogen atom. 
     
     
       9. A composition as claimed in claim 8, wherein R 2  represents a carboxyl group or a protected carboxyl group. 
     
     
       10. A composition as claimed in claim 8, wherein R 2  represents a carboxyl group, R 3  represents a hydrogen atom, R 8  and R 9  represent hydroxy groups, and R 14  represents a carboxyl group. 
     
     
       11. A composition as claimed in claim 9, wherein the absolute configuration of the carbon atom to which R 2  and R 3  are connected is (S)-configuration. 
     
     
       12. A composition as claimed in claim 10, wherein the absolute configuration of the carbon atom to which R 2  and R 3  are connected is (S)-configuration.